adjective🔗Share古生代的 Of a geologic era within the Phanerozoic eon that comprises the Cambrian, Ordovician, Silurian, Devonian, Carboniferous and Permian periods from about 542 to 250 million years ago, from the age of trilobites to that of reptiles."My daughter is learning about the Paleozoic era in her Earth Science class, studying fossils of sea creatures from that ancient time. "我女儿在地球科学课上学关于古生代的知识，研究那个遥远时代海洋生物的化石。geologyagetimehistoryscienceChat with AIVocabulary GamePractice Reading
